Angle iron which is made from basic materials of billets and scrap. Billet, which is a type of steel bar produced from casting iron ore or pig iron. Meanwhile, scrap is used iron which is heated at a certain heat so that it can be reprinted into new iron. There are two types of angle iron, apart from being distinguished by the degree of angle, which is based on its shape. There is plain angle iron and there is also angle iron perforated, both of which can be relied upon as a support for construction structures, but they differ in the areas of use.